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clear, and exact description.

*and one-third parts; lime, sixty-six and two These ingredients I placein a Z'o all whom it may concern.-

' i IUNITED STATES PATENT OFFICE.

RIOH ARD D. A. PABROTT,OF GREENWOOD IRON WORKS, NEW YORK.

COMPOSITION FOR MINERAL WOOL.

SPECIFICATION forming parnoi' Letters Patent No. 372,486, dated November1, 18E.7. Application filed September 25 i896. Serial No. 214,566. (Nosgecimens.)

Be-it known that I,.RICHARD D. A. PAIR.- ROT'r, of Greenwood Iron Works,in thc county :of Orange and State of New York, have invented a new andImproved Composition for Mineral Wool. ofwhich the following isa full;

--The object. of 'my' invention is to furnish a cheap andreadily-manipulated composition for the manufacture of mineralwool.

' Myimproved composition consists inthe following ingredients combinedin about the proportions statcd, viz': feldspar, thirtythree thirdsparts. cupola-furnace and fuse by ineansof any available fuel-snch asanthracite coal, coke, charcoal, or fuel-gas; but I preferably employfuel containing little or no sul'phursuch as charcoal or fuel-gas- -asthe product, when free from sulphur, is superior to that containingsulphur When the ingredients are thoroughly melted and mixed together, Idischarge them from the cupola-furnace in asmall stream and bring a jetof steam or compressed air to act upon-the stream of melted material,blowing it out into a fibrous mass.

By the 'term feldspar I mean to include the whole class of feldspars,viz: potash-feldspar or orthoclase, soda-feldspar or albite, and

potash-lime-soda-feldspar, or oligoclase; and by the term lime I mean toinclude lime, carbonate of lime or marble and shells, and carbonateoflime and magnesia or dolomite.

I am aware that glass has been made of the thirty-three and one-thirdparts, and lime,

sixty-six and two-thirds parts, the said materials being combined byfusion, as herein specified.

' RICHARD D; A. PARROTT.

Witnesses:

OARTHUR H. SMITH,

JOHN F. BUGGY.

